Correct Option: B

Direct Action Day was observed by Mulsim league on 16th August, 1946. Direct Action Day also known as the Great Calcutta Killings, was a day of widespread riot and manslaughter between Hindus and Muslims in the city of Calcutta (now known as Kolkata) in the Bengal province of British India. The day also marked the start of what is known as The Week of the Long Knives.